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TECHNICAL REFERENCE LIBRARY
Crossover Cable

This document shows how to properly construct an ethernet Crossover network cable. This cable can be used to cascade hubs, connecting two Ethernet hosts back-to-back without a hub or switch, or connecting two CSU/DSU's back to back for local testing of Wide Area Network (WAN) configurations. This crossover cable will work for 10BASE-T & 100BASE-TX. NOTE: You cannot use crossover cables on 100BASE-T4 devices. Use Category 5/5e unshielded twisted-pair (UTP) cable. The maximum cable distance between the port and the attached device is 100 meters (328 feet) including all patch cables, panels, and connectors. The minimum length is 1 meter (3 ft).

Pin Colors on one end of Cable Pin Colors on other end of Cable
1 White/Orange          (TD+) 1 White/Green          (RD+)
2 Orange/White          (TD-) 2 Green/White          (RD-)
3 White/Green            (RD+) 3 White/Orange        (TD+)
4 Blue/White              (N/A) 4 Blue/White              (N/A)
5 White/Blue              (N/A) 5 White/Blue              (N/A)
6 Green/White            (RD-) 6 Orange/White        (TD-)
7 White/Brown          (N/A) 7 White/Brown          (N/A)
8 Brown/White          (N/A) 8 Brown/White          (N/A)

RJ-45 PLUG RJ-45 PLUG UTP PAIR COLORS:
    PAIR 1 - BLUE
    PAIR 2 - ORANGE
    PAIR 3 - GREEN
    PAIR 4 - BROWN
Category 5 wiring standards:

EIA/TIA 568A/568B and AT&T 258A define the wiring standards and allow for two different wiring color codes.
Pin # EIA/TIA 568A AT&T 258A, or EIA/TIA 568B Ethernet 10BASE-T Token Ring FDDI, ATM, and TP-PMD
1 White/Green White/Orange X   X
2 Green/White Orange/White X   X
3 White/Orange White/Green X X  
4 Blue/White Blue/White   X  
5 White/Blue White/Blue   X  
6 Orange/White Green/White X X  
7 White/Brown White/Brown     X
8 Brown/White Brown/White     X

  • Pairs may be solid colors and not have the stripe.
  • Category 5 cable must use Category 5 rated connectors.
  • Use plenum cable where applicable.
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Page last modified on: Wednesday November 9, 2011 at 13:11